第1个回答 2010-05-10
ORG 0000H
AJMP MAIN
ORG 000BH
AJMP PT_0
ORG 0100H
MAIN: MOV R2,#00H
MOV TMOD,#02H
MOV TH0,#0D8H ;晶振为6M
MOV TL0,#0D8H ;X=216
SETB P1.0
SETB TR0
SETB ET0
SETB EA
HERE: SJMP HERE
PT_0: CJNE R2,#05H,PT01
SETB P1.0
MOV R2,#00H
RETI
PT01: CLR P1.0
INC R2
RETI
END本回答被网友采纳